Ore-grinding machine.



G. A. DENNY.

01m GRINDING MACHINE.

APPLIOATION FILED JUNE 18, 1907.

Patented Jan. 12, 1909.

ms mmms PETERS co., WASHINGTON. nc,

-j T FFQE.

GEORGE ALFRED DENNY, OF LONDON, ENGLAND.

ORE-GRINDING MACHINE Specification of Letters Patent.

Patented Jan. 12, 1909.

Application filed June 18, 1907. Serial No. 379,633.

To all whom it may concern:

Be it known that I, GEORGE ALFRED DENNY, a subject of the King of GreatBritain and Ireland, and resident of Salisbury House, London W'all,London, in the county of London, England, have invented certain new anduseful Improvements in Ore-Grinding Machines, of which the following isa specification.

This invention relates to grinding machines, and has specially in viewcertain improvements in the type of grinding machines known as cone andshell machines in which rovision is made for utilizing the centrifugaforce of the machine to assist in feeding the material, therebydispensing, to a large extent, with the use of water.

With the above and many other objects in View, the inventioncontemplates certain novel features of construction and combination ofparts which will. be described in de tail in the following description,pointed out in the claim, and illustrated in the drawings.

In said drawings, wherein a preferred embodiment of the invention hasbeen shown, Figure 1 is a side elevation of the machine showing itsconnection with the source of power and also the manner of feeding material to the grinding members. Fig. 2 is a top lan View of the same.Fig. 3 is a part sectlonal view of the structure shown in Fig. 1. Fig. 4is a detail view of the connection between the grinding cone and itsoperating shaft. Fig. 5 is a detail view of the operat ing shaft showingits connection with the guiding sleeve.

Like characters of reference refer to corres onding parts.

n the accompanying drawings, 10 designates a suitable base which hasmounted thereon a frame composed of side members 11-11 and a toconnecting horizontal member 12 provided with a central opening 13. Saidframe, which will be hereinafter referred to as the lower frame, forms abase support for an upper frame which is of similar construction as thelower frame, but of asmaller size, and comprises the two side members14-14 and top connecting horizontal mem ber 15 provided with a centralopening 16 in alinement with the opening 13 in the lower frame.

The grinding mechanism of the machine is composed of two hollowedinverted cone shaped members 17 and 18, res ectively. The cone shapedgrinding member 18 is mounted on the base 10 and has an inlet formed inits lower extremity or apex, as at 19 which is in communication with afeeding pipe 21 which conveys the material to the said member 18. Themembers 17 and 18 are of such a size as to permit of one being freelyrevolved within the other, and as shown in the preferred construction,the member 18 is a stationary one, it being held in rigid engagementwith the .base 10 by means of the ribs 22. Each of said members isprovided with grinding teeth 2324, respectively which are held on thesurfaces of the members by means of bolts or the like 25, in such amanner as to permit of their being readily removed when desired or Avertically arranged drive or operating shaft 26 has a keyed connection27 with a guiding sleeve 28, and said shaft, with its connected sleeveextends through the opening in each of the upper and lower frames,suitable bearings 2930 being interposed between the sleeve and the sidesof the openings to reduce friction. The keyed connection between theshaft and its guiding sleeve is arranged longitudinally and is of aloose nature which permits of the shaft being adjusted vertically withreference to said guiding sleeve, but a relative rotary movement of thetwo members will be prevented.

The lower portion of shaft 26 projects beyond the top member of thelower frame and at its extreme lower end a rectangular frame 31 has twoof its diametrically opposite sides pivotally connected thereto. Asupporting truss or beam 32 incloses said rectangular frame 31, and isarranged to engage and be pivotally connected with the side members ofsaid frame that are not connected with the end of the shaft. The outerends of said beam or truss are connected with the head of the grindingcone 17. The form of connection between the truss or beam and the end ofthe shaft forms what is known as a gimbal joint, and provided for auniversal movement of the grinding cone 17 to compensate for wear etc.upon the grinding surface thereof.

The portion of the guiding sleeve 28 within the upper frame has fastthereon a horizontally arranged beveled gear wheel 33 with which meshesa vertically arranged bevel pinion 34: carried by a horizontal shaft 35which projects through and has bearing within one of the side members ofthe upper frame, the outer end of said shaft carrying pulleys 36-37,which may be connected with a suitable source of power.

The upper end of the vertical shaft has a hollow threaded portion 38adapted to receive a similarly threaded adjusting rod 39 carrying a handwheel 40, the hub 41 of which normally rests upon a cap 42 at the upperend of the guiding sleeve. As shown more clearly in Fig. 3 of thedrawings, the upper end of the guiding sleeve projects beyond the upperplane of the end of the shaft thereby providing a clearance space forthe longitudmal adjustment of the shaft when the hand wheel is operatedto effect such adjustments.

The operation of the machine is as follows :The material to be actedupon enters through the inlet of the stationary cone where it is caughtand crushed between the spirally arranged teeth of the rapidly revolvingcone and the teeth of the stationary cone. And in the crushingoperation, the tendency of the spiral teeth assisted by the centrifugalforce exerted by the revolving cone, causes the material to be carried.upwardly during the crushing operation until it reaches the top of thestationary cone where it flows out into a suitable delivery chute 43 atone side of the said stationary cone.

In grinding or crushing various grades of ores, it is necessary thatdifferent degrees of crushing be had for certain grades of ores. Toallow for this, the described method of adjusting the drive shaft withits connected rotary grinding cone is provided, by means of which thesaid rotary cone may be quickly adjusted in a vertical plane relativelyto the stationary grinding cone. And it will be understood that by meansof the gimbal connection between said rotary grindin member and thedrive shaft, any inequa ities in the material being treated, or any wearon without in any way interfering with its proper grinding of thematerial.

A prominent and distinctive feature of the invention resides in theunderfeed arrangement for the material to be crushed, by means of whichsaid material is conveyed to the lower portion of the stationarycrushing cone and from that point caused to ascend until thetop of saidcone is reached where it is delivered in a finely crushed or powderedcondition. By this arrangement it is possible to use the machine withlittle or no water pressure, other than what is neces sary to cause thematerial to flowto the point of entry into the stationary cone.

While in the foregoing description I have set forth the preferred formof the invention and also the preferred manner of using the same, I wishit to be understood that I do not limit myself to the preciseconstruction and method of use therein set forth, as changes in theconstruction and manner of use may be resorted to without-departing fromthe spirit of the invention.

I claim as my invention A grinding machine comprising a lower stationarycone member having at its apex a bottom inlet and provided-upon itsinner inclined face with a plurality of longitudinally arranged grindingteeth, a vertically disposed drive shaft arranged above andcon- Vcentric to said stationary cone member,

In witness whereof I have affiXed my signature in presence of twowitnesses.

GEORGE ALFRED DENNY. Witnesses:

T. J. DENNY, RoBT. GUNTER.

